Flow controlling unit for gas burners



7, 1936. `N T BRANCHE 2,036,849

FLOW CONTROLLIYNG UNIT FOR GAS BURNERS Filed June 3o, 1934,

HTTOR/VE K Patented Apr. 7, 1936 UNITED STATES FLow coNrnoLuNG UNrr Fon Gas v UaNEns Nelson T.- Branche, Toledo, Ohio, assignor to Surface Combustion Corporation, Toledo, Ohio, a corporation of New York Application June 30, 1934, Serial No. 733,281

2 Claims. (Cl. 50-24) The present invention has for its object to provide new and useful improvements in means for controlling the flow of fuel to gas burning apparatus, and more particularly to provide a control mechanism which shall comprise, in a single unit, a gas shut-ofi valve and a pressure regulator in such combinatlonal arrangement that even though the shut-oil valve be closed to cut 01T the ow of fuel to the main burner, the pressure regulator will function to regulate the pressure of the gas flowing to pilot for the burner.

Referring to the drawing wherein the preferred form of the invention is shown,-

Fig. 1 is a side view in vertical section of the l.: apparatus comprising the present invention;

Fig. 2 is an end view of the same with some parts omitted and others in section; and

` Fig. 3 is a fragmentary view on a reduced scale,

the view being taken on line 3--3 on Fig. 2.

In the drawing, IIJ indicates a portion of a rectangular casing for housinga plurality of mixing tubes I I which deliver to a burner of the same general type as is shownl in my. Patent No. 1,927,019 dated September 19,1933. Primary and secondary air for the burner enters the casing through an inlet controlled by l. a damper I2 mounted to turn on a horizontal pivot I2', the casing having an end wall `lili adjacent to said inlet.

Each mixing tube is secured, atacent its inlet end, to the lower wall I0' of the casing I0 by a cap screw |3. The inlet end of each mixing tube is of the usual flaring construction for receiving both air and fuel gas, the admission of air to the tube being controlled by a shutter |4 which is hinged as .at I5 to the lower rim of the tube, a spring I6 being provided at the hinge for normally holding the shutter open. The position of the shutter is controlled by an adjustable screw rod I1 supported in a manner hereinafter y cover I 8, at one end thereof, is a cross bar 2| which is secured to said wall I0.. by cap screws 20. Adjustably positioned in the ends of the crossl bar 2| and extending through said wall Illa are upright posts 22 for supporting the outer end of the casing I0 on a oor 23 or the like. Clamped between the covers I8 and I9 is a diaphragm 25 of leather or the like; and.- supported on the diaphragm is a loading plate 26. A backing plate 2l and a cap screw 28 hold the diaphragm and loading plate together. The cap screw has an axial bore and radial connecting holes 28' 5 in its head: and the loading plate 26 has an axially apertured pillar 29 from which extends an axially apertured valve 30, and from the valve extends a bent tube 31.

Detachably secured to the top I9 ofthe dialo phragm case is a hollow body which is divided by a partition 3| to form two pressure chambers 32 and 33 which are in communication through an upright conduit 34 which forms an opening through the partition. The inlet to the chaml5 ber 32 is indicated at 35 in Fig. 2 and a gas supply pipe 36 is shown as delivering to said inlet.

The chamber above the diaphragm 25 ls open to the atmosphere vor to the interior of the casing I0 by a vent 38 from which extends a short pipe 20 39. To prevent the leakage of gas from the inlet chamber 32 to the chamber above the diaphragm, there is provided a exible seal 4l) which is clamped between the valve 30 and the pillar 29 and the top of the member I9 and the lower end 25 of the chambered body.

Arranged to seat on the upper end of the conduit 34 is a shut-on valve 4|. `The stem 42 of this valve extends through a head 43 at the ytop of the neck 44 of the outlet chamber 33, the'head being 30 held to its s`eat by a clamping nut 44. Projecting from the head 43 is a chassis 45 which 'forms a support for a motor mechanism (not shown) but which is housed by the cover 46. Between the head 43 and valve 4| is a coil spring 41 which 35 gas outlet or passage 52 through which gas is free to flow to a pilot when a vvalve?,@inside of a valve enclosure 53 is open.

Forming part of the chamber33 is a header 54 50 which extends above and the diaphragm cover I9 at one side of the-'latter'.iltlie header having down-turned ends y55. Screwed v:into and extending from each end 55 oi the header lis a gas discharge tube 56 whichA extends -through 66 the casing waii et, the shutter '13 center-1 ing hub 5? in the inet end of the mixing tube, it being noted that the discharge end ci the tube is reiativeiy restricted to form a discharge noazie.

Associated with each tube 59 is a fiow ccntrolling valve comprising a tapered head 58 having a restricted axial passage 58' therethrough and radial guiding wings 59 for the head. The stem of the valve comprises two spaced parallelly extending members 60 which join in a hub 6l in which is swivelled one end of a screw 62 which projects through the header 54 and into a fitting 63 screwed into the header wall as clearly shown in Fig. 3. The outer end of this tting is closed by a cap screw 64 which is lremoved when the screw B2 is to be turned to adjust the valve. The restricted passage 58' insures a minimum flow of gas even though the valve proper may be closed and insures that such minimum shall be discharged as a jet having an air entraining effect.

Extending through and supported by the end wall 66 of the casing -I0 is a screw rod 68 which cooperates with a depending finger 69 on the damper i2 to it the degree of opening of the latter. The rod Il for adjusting the degree of opening of the air shutter I4 also extends through said wall 6B; but instead of being supported by said wall it is supported by the header 54, as indicated at 65. A removable end cover 6l cooperates with the extension of the casing i0 to conceal the mechanism inside of said extension.

It will be readily appreciated that such gas pressure as is effective inthe conduit 36 will also be eiective on the underside of the diaphragm 25 by reason of the pressure passage beginning with the top of the tube 3l and ending with the radial ports 28 in the cap screw 28; and also that if such pressure exceeds the weight on the diaphragm, the latter will move the valve 30 upwardly to restrict the eiective inlet area of the conduit 39 with resultant reduction of pressure in the conduit 34. When the valve di is closed it will appreciated that conduit functions as a pressure chamber insofar as 'the gas entier, is concerned and, therefore, that gas at regulated pressure will be supplied to the pilot for the burner even though the valve El! is closed. The upper end or the tube 37 is bent laterally to compensate for suction eiect produced by the gas in owlng through the conduit 3d. when the valve di is open.

' Certain features not claimed herein are claimed in a divisional application Serial No. 1,003 iiled January 9, 1935, now Patent No. 2,025,696 issued Dec, 24, 1935.

What I claim as new and desire to secure by Letters Patent is: v

l. In combination, two chambers separated by a. iiow passage having oppositely-facing valve seats, a pressure regulator valve facing one of said seats, a diaphragm for moving said valve towards its seat when pressure is applied to one side of the diaphragm, means including a tube projecting from the seating side of said valve into said passage for establishing open communication between the pressure side of the diaphragm and said passage, a shut-off valve arranged to seat against the other of said valve seats, and a gas take-orf passage leading from the side of the said ow passage.

2. In combination, two chambers separated by a flow passage having oppositely-facing valve seats, a pressure regulator valve facing one of said seats, a diaphragm for moving said valve towards its seat when pressure is applied to one side of the diaphragm, means including a tube projecting from the seating side of said valve into said passage for establishing open communication between the pressure side of the diaphragm and said passage, a shut-oi valve arranged to seat against the other of said valve seats, said tube being angled toward the side of said passage, and a gas take-oir passage leading from the side of said ow passage.

NELSON T. BRANCHE. 

